According to the Visa Regulations of the Republic of Croatia, Visa requirements are waived for citizens of most of the European countries, EU countries, USA, Canada, Israel, Japan, Brazil, etc.
To find out whether you need a Visa to enter the Republic of Croatia, please visit the web page of Ministry of Foreign Affairs of the Republic of Croatia.
If you have a valid Schengen VISA for multiple entry to Europe you don’t need to apply for Croatian VISA separately, because the Schengen is valid for Croatia as well.
Upon request, the Conference Organizers will provide a Letter of Guarantee to facilitate the issue of a Visa. If you are not sure whether you need one or not, visit the Croatian Ministry of Foreign Affairs' web page.
Important information about visa requirements.